Step |
Hyp |
Ref |
Expression |
1 |
|
upwlksfval.v |
|
2 |
|
upwlksfval.i |
|
3 |
1 2
|
upwlksfval |
|
4 |
3
|
brfvopab |
|
5 |
4
|
a1i |
|
6 |
|
elex |
|
7 |
|
elex |
|
8 |
|
ovex |
|
9 |
1
|
fvexi |
|
10 |
8 9
|
fpm |
|
11 |
10
|
elexd |
|
12 |
7 11
|
anim12i |
|
13 |
12
|
3adant3 |
|
14 |
6 13
|
anim12i |
|
15 |
14
|
ex |
|
16 |
|
3anass |
|
17 |
15 16
|
syl6ibr |
|
18 |
1 2
|
isupwlk |
|
19 |
18
|
a1i |
|
20 |
5 17 19
|
pm5.21ndd |
|